Comparison between a built‐in “dual side” chest imaging device and a standard “single side” CR

An integrated readout computed radiographysystem (Fuji XU-D1) incorporating dual-side imaging plates (ST-55BD) was analyzed in terms of modulation transfer function(MTF),noise power spectrum (NPS), and detective quantum efficiency (DQE) for standard beam qualities RQA 9 and RQA 5. NPS and DQE were assessed using a detector entrance air kerma consistent with clinical practice for chest radiography. Similar investigation was performed on a standard reader (Fuji FCR 5000) using single-side imaging plates (ST-VI). Negligible differences were found between the MTFs of the two imagingsystems for RQA 9, whereas for RQA 5 the single-side system exhibited slightly superior MTF. Regarding noise response, the dual-side system turned out to be better performing for both beam qualities over a wide range of frequencies. For RQA 9, at 8 μ Gy , the DQE of the dual-side system was moderately higher over the whole frequency range, whereas for RQA 5, at 10 μ Gy , significant improvement was found at low- and midrange frequencies. As an example, at 1 cycle ∕ mm , the following improvements in the DQE of the dual-side system were observed: + 22 % (RQA 9, at 8 μ Gy ), + 50 % (RQA 9, at 30 μ Gy ), and + 45 % (RQA 5, at 10 μ Gy ).